//go:linkname SendmsgNInet6 syscall.sendmsgNInet6
//go:noescape
func SendmsgNInet6(fd int, p, oob []byte, to *syscall.SockaddrInet6, flags int) (n int, err error)

//go:linkname RecvmsgInet4 syscall.recvmsgInet4
//go:noescape
func RecvmsgInet4(fd int, p, oob []byte, flags int, from *syscall.SockaddrInet4) (n, oobn int, recvflags int, err error)

//go:linkname RecvmsgInet6 syscall.recvmsgInet6
//go:noescape

	return 0, syscall.ENOSYS
}

func SendmsgNInet6(fd int, p, oob []byte, to *syscall.SockaddrInet6, flags int) (n int, err error) {
	return 0, syscall.ENOSYS
}

func RecvmsgInet4(fd int, p, oob []byte, flags int, from *syscall.SockaddrInet4) (n, oobn int, recvflags int, err error) {
	return 0, 0, 0, syscall.ENOSYS
}

	return 0, syscall.ENOSYS
}

func SendmsgNInet6(fd int, p, oob []byte, to *syscall.SockaddrInet6, flags int) (n int, err error) {
	return 0, syscall.ENOSYS
}

func RecvmsgInet4(fd int, p, oob []byte, flags int, from *syscall.SockaddrInet4) (n, oobn int, recvflags int, err error) {
	return 0, 0, 0, syscall.ENOSYS
}

	pp := (*RawSockaddrInet6)(unsafe.Pointer(&rsa))
	port := (*[2]byte)(unsafe.Pointer(&pp.Port))
	from.Port = int(port[0])<<8 + int(port[1])
	from.ZoneId = pp.Scope_id
	from.Addr = pp.Addr
	return
}

func recvmsgInet4(fd int, p, oob []byte, flags int, from *SockaddrInet4) (n, oobn int, recvflags int, err error) {
	var rsa RawSockaddrAny
	n, oobn, recvflags, err = recvmsgRaw(fd, p, oob, flags, &rsa)
	if err != nil {
		return
	}

		return 0, 0, 0, err
	}
	defer fd.readUnlock()
	if err := fd.pd.prepareRead(fd.isFile); err != nil {
		return 0, 0, 0, err
	}
	for {
		n, oobn, sysflags, err := unix.RecvmsgInet4(fd.Sysfd, p, oob, flags, sa4)
		if err != nil {
			if err == syscall.EINTR {
				continue
			}
			// TODO(dfc) should n and oobn be set to 0
			if err == syscall.EAGAIN && fd.pd.pollable() {